/*重置样式*/ 
*{
    padding: 0;
    margin: 0;
    outline: 0;
    border: 0;
}
ul,ol,li{
    list-style: none;
}
a{
    text-decoration: none;
}
/*下面是自己封装的样式*/ 
.whitebg{
    background: white;
    padding: 20px;
    border-radius: 4px;
}
.center{
    text-align: center;
}
.icon{
    margin:16px;
}
.fa span{
    margin: 0 5px;
    color: blue;
}
.img{
    width: 50px;
    height: 50px;
}